<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>

<form id="form1">
    <input type="text" name="uname" autocomplete="off"/>
    <input type="password" name="upwd"/>
    <button type="submit">提交</button>
</form>

<script>
    // 1. 通过 DOM 操作，获取到 form 表单元素
    var form = document.querySelector('#form1')

    form.addEventListener('submit', function (e) {
        // 阻止表单的默认提交行为
        e.preventDefault()

        // 创建 FormData，快速获取到 form 表单中的数据
        var fd = new FormData(form)

        var xhr = new XMLHttpRequest()
        xhr.open('POST', 'http://www.liulongbin.top:3006/api/formdata')
        xhr.send(fd)

        xhr.onreadystatechange = function () {
            if (xhr.readyState === 4 && xhr.status === 200) {
                console.log(JSON.parse(xhr.responseText))
            }
        }
    })
</script>

</body>

</html>
